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continuously monitor program

continuously monitor program

continuously monitor program

(OP)
I have a systemtap script (loop.stp) that continuously runs and prints output periodically. I want to monitor this output from a perl script. Why does this code below not print anything? If I change this to /bin/ps, it does print the entire output when the command exits. I need it to print output as it occurs since the program will never end.

CODE

open(STAP, "/root/loop.stp");
while ( <STAP> ) {
  print;
} 

RE: continuously monitor program

(OP)
Typo above, I forgot the pipe. This only prints when the command exits, not in real time.

CODE

open(STAP, "/root/loop.stp |");
while ( <STAP> ) {
  print;
} 

--
Chris
RHCE, SCSA, AIX5L, LPIC, CNE, CCNA, MCSE

RE: continuously monitor program

(OP)
FYI, forgot to include this in the original post. If I change the program to monitor another perl script and add "$| = 1" in the other perl script, this works. I need to do the equivalent in the systemtap script somehow.

Thanks!

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